Finding moles of iron in a sample

Finding moles of iron in a sample

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Credit: MARTYN F. CHILLMAID/SCIENCE PHOTO LIBRARY

Caption: A student titrates permanganate (MnO4-) to acidified iron (Fe2+ (aq)) solution. The conical flask contains dissolved iron (II) to which is added sulphuric acid to make sure the solution is acidic. The burette contains potassium permanganate (KMnO4), a strong oxidizing agent, with a known molarity. As the potassium permanganate is dripped into the flask the purplish colour disappears as permanganate (MnO4–) changes to clear manganese (Mn2+). The end point is reached when the solution turns a faint pinkish purple. The object is to ascertain the moles of iron in the sample.

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Keywords: acidic, acidified fe2+, burette, conical flask, dissolved iron ii, end point, iron, known molarity, mn2+, mno4-, nitrile gloves, no-one, nobody, oxidizing agent, potassium permanganate, solution, sulphuric acid, titrates

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